Boiler-furnace



(No Model.)

J. W. HARMEL 8v W. J. GALLOWAY.

BOILER FURNACE.

f Hrfgesszs nary bridge-wall and spaced in 4parallel rela- JOHN w. IIARMEL AND wILLIAMdJ.' GALLowAY, or PEKIN, ILLINoIs.

y f legenden-FuFermes.

srnoIFIoATIoNformiagpart of Letters Patent No; 605,281, dated June 7, ieee, Application tiled July 22, 1897. Serial No. 645,533. V (No model.)

To a/ZZ whom t may concern: l

13e it known that we, JOHN W.HARMEL and WILLIAM J. GALLowAv, citizens ofthe United States, residingat Pekin, in the county of Tazewell and State of Illinois, have inventeda new and useful Boiler, of which the following is a specification. y 4 i Our invention relates to improvements in boiler setting and coverngyand the object that we have in view is to improve the construction of the boiler-setting ina manner to provide a combustion-chamber inrear of the bridge-wall, into which chamber the heat and products of combustion are delivered from the nre-grate chamber, soas to be consumed in said combustion-chamber to generate an intense heat and effect economy of' the Afu'el required to maintain the steam in the boiler.

To the accomplishment of this end our invention consists in the combination, with a setting, a bridge-wall, and alboiler, of a second bridge-wall situated in rear of the ordition thereto 'tofo'rm between the two walls a combustion-chamber. The bottom of this combustion-chamber is of curved form, with its middle portion on the level ofthe bottom of the ash-pit and with its ends extended upwardly toward thetop edgesof said walls, that portion of .the concave or curved bottom forming a deflector by whichfthe circulating products of combustion in said chamber are"` thrown backwardly from the rear Wall and are caused to circulate within the chamber to effect the combustion ofthecarbon in the smoke to the best advantage and to' increase the volume of heat derived from the consumption of the fuel supplied to the gratechamber. One of the importanty features of our invention consists in extending the rear wall upwardly toward the bottom of the boiler,so as to have its upper edge terminate the rear wall is not, however, of an area restricted to less than the cross-sectional area boiler without impeding the draft, but at the same time operates to check the passage of the unconsumed and heavier products of combustion to enable the deflecting-surface inthe combustion-chamber to throw such unconsumed products ofl combustion baci; into the combustion-chamber to be converted by the ilame therein intov heat; and the invention further consists in the novel construction and arrangement of parts,which will be hereinafter fully described and claimedQ` We have illustrated the preferred embodiment of our invention in the accompanying drawing, forming a part ofthis specification, in'which the figure represents a perspective view,partly broken away, of aboilerembody- `ing our invention.

In the drawing, 1 designates the boilerfront.`- 2 is the breeching. 3 is the boiler proper. iis the steam-dome. 5is the steampipe, and G are the walls ofthe boiler-setting. Thesey parts may be of the usual or any preferred construction; but we construct the space belowthe boiler and within the setting in'accordance with our invention, as y hearth a suitable distance, and the top edge.

or surface of said wall 7 -is constructed with a sloping face 11 between the horizontal top edgel2 and the horizontal front ledgeY 13. The usual grate-bars 1,4 are supported on this horizontal ledge 13 of the frontwall Tand on the boiler-front l, the latter being provided with any suitable means forholding the gratebars. An ash-pit 15 is provided, as usual, between the wall 7, the boiler-front, and the grate. It will be observed that the inclined `face 11 of the Wall 7 extends upwardly and IOO backwardly from the grate 111, thus providing for the uninterrupted iiow of the heat and products of combustion over the bridge-wall 7 into the combustion-chamber 9.

The rear wall 8 is erected adjacent to the back wall of the boiler-setting and in a vertical plane near the rear end of the boiler 3, Where it receives the heat and gases from the combustion-chamber. This rear wall 8 extends from the hearth or ground upwardly near the lower surface of the boiler 5. but the bridge-wall does not extend to the boiler, but terminates a suitable distance below the same to provide a throat or passage 16 between the upper edge of the rear Wall 8 and the boiler 3. This throat or passage 16 is of less area than the passage between the boiler and the front bridge-wall 7; but the cross-sectional area of said restricted throat or passage 16 is somewhat greater than the cross-sectional area of the fire-tubes in the boiler 3. We prefer to make this throat 16 about ten per cent.

greater in area than the area of the fire-tubesin the boiler for the purpose ofy giving to the heat and gases the necessary uninterrupted current or ilow from the combustion-chamber to the boiler-fines, and thus avoid impairment to the draft through the combustion-chamber and theboiler; but this arrangement of the rear Wall serves in a measure to prevent the ,heavy and unconsumed products of combusthe' unconsumed heavy matters in the products of combustion, we have constructed the bottom of the combustion-chamber in a peculiar manner. tion-chamber9 is of curved form throughout its length, and it extends upwardly in relation to the opposing faces of the front and rear walls 7 8,'the lowest point of this concaved bottom 17 being on the plane of the bottom ofthe ash-pit in the grate-chamber of the furnace. The front part of the concave bottom 17 extends well up toward the rear surface of the front wall 7, and the rear part of said concave bottom'extends in like manner up the front surface of the rear wall 8,

whereby these extended concave surfaces of f the bottom form deflectors, (indicated at 18` 19,) against which may impinge the heavyI substances contained in the products ofcom- 2 bustion.

As the smoke and products of combustion i pass over the front wall 7 from the grate 14 they descend somewhat into the combustionof combustion are thrown back into the chamber 9, while the heat and lighter gases flow` The bottom 17 of the combusl the restricted throat 16, and thence into the boiler-fines, the tailpiece 2O serving to arrest the escape of the heat and gases from the space between the rear extremity of the boiler and the rear wall of the boiler-setting. The heavy products of combustion deflected byv the surface 19in the combustion-chamber meet with the flame and heat from the grate-v chamber, and thus the carbon or soot in the smoke and the unconsumed products of combustion are converted into heat, sufficient oxygen passing through the ash-pit and the gratechamber to sustain combustion within the combustion-chamber 9 of the furnace.

We construct the top part of the rear wall 8 in the same manner as the top part of the front wall 7, except for the horizontal front ledge that sustains the grate-#that is to say, this rear wall 8 has its front part sloped or inclined downwardly and forwardly, as at 2l, leaving a horizontal top edge at 22. This rear Wall 8 is utilized to support the pillars 23, one of which is shown in the drawing, for supporting the rear edge of the boiler.

The bottom 17 of the combustion-chamber may be made of any suitable material; but we prefer to construct it of iireproof material, such as a mixture of yellow clay, flour, alum, stable manure, white glue, salt, and lime. The exposed surfaces of the boiler, the steam dome, the tailpiece 20, and the steam-pipe are inclosed within or covered by a suit-able iireproof covering, indicated at 25 andconsisting of a mixture of the ingredients above referred to.

Our improved construction of the combustion-chamber enables us to attain perfect combustion of the fuel, thus effecting a saving of from twenty-five to fifty per cent. of fuel rcquired to maintain the heat in the boiler, and we are also enabled to apply uniform heat to the boiler and to secure an increased draft through the boiler and its heating appliances.

We are aware that changes in the form and proportion of parts and in the details of construction may be made by a skilled mechanic without departing from the spirit or sacrics ing the advantages of the invention.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

The combination with a boiler-setting, a grate, and a boiler, of a front bridge-wall supporting the grate and terminating below the boiler to provide a passage of sufficient area for the free escape of the products of combustion from the grate-chamber, a rear wall arranged within the setting parallel to the bridge-wall to form the combustion-chamber,

Isaid rear wall terminating on a plane above the front bridge-wall and close to the boiler, and forming with the latter a contracted throat or passage of an area greater than the IOO IIO

chamber and terminating below the upper asvour own We have hereto aiixed our signaedges of the front and rear Walls, whereby the tures in the presence of two Witnesses. rear Wall intercepts the products of eombus- A tion as they flow from the combustion-eham- IAIIEILWAY 5 ber and the restricted throat or passage avoids v l J undue checking of the draft, substantially as Witnesses: described. v c W. W. SELLERS, In testimony that We claim the foregoing CHAS. B. SMITH. 

